US1296797A - Grain-grinding mill. - Google Patents

Description

A. T. HARE. GRAIN GRINDING M|LL. APPLICATION FILED DC.26. I916.

Patented Mar. 11, 1919.

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A. T. HARE.

GRAIN GRINDING MILL. APPLICATION FILED DEC .26. 1916.

1,296,797. Patented Mar. 11,1919.

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ASBERY 'r. HAnn, or BAInnY'ron, ALABAMA,

GRAIN-GRINDING MILL.

Specification of Letters Patent.

Patented Mar. 11, 1919.

Application filed December 26, 1916. Serial Ito-138,934.

To all whom it may concern Be it known that I, ASBERY T. HARE, a citizen of the United States of America, residing at Baileyton, in the county of Cullman and State of Alabama, have invented certain new and useful Improvements in Grain-Grinding'Mills, of which the following is a specification.

My invention relates to a mill for crushing and grinding corn and other grain.

One distinctive feature of my invention relates to the structure of the frame work of the mill. This is formed in three parts comprising a base or bed and two frames position where they can be most conv'en- Y iently dressed. 7

Another feature of my invention relates to the manner in which the stones are adjusted. This I accomplish by drawing the stone carrying frames together by four cross'bolts carrying inner adjustable stops and end nuts by means of which the frames can be set with the grinding faces of the stones in contact throughout, after which, by means of a set screw acting on the outer end of the mandrel of the running stone, the latter can be allowed to recede the desired distance from the bed stone. This spacing of the stones is preferably accomplished'by means of a spring acting on the mandrel to force it against said set screw.

Another important feature of my invention has for its obj ectto largely increase the capacity of the mill and the quality of the meal or flour without increasing the runnin speed of the stones or the power required to drivethem. This I accomplish by providing in the eye of the bed stone, through which the grain is fed, a crushing means comprising metallic crushing elements which deliver crushed grain to the stones which finish the grinding. I thus rely upon a metallic crusher in combination with rinding stones, as a finishing means, for obtaining such improved results.

Another feature of my invention relates to the means provided for maintaining the balance of the running stone, this being accomplished by recesses formed in the back thereof and carrying radial screws With tenance of the smooth running of the moving stone isimportant in preserving univ formity in the grinding of the mill,

My invention further comprises the novel detail of construction and arrangements of parts, which in their preferred embodiment only are illustrated in the accompanying drawings, in which Figure 1 shows the mill in side elevation with the parts in operating position.

Fig. 2 is a similar view showing the stone frames opened out.

Fig. 3 is a longitudinal vertical section taken along the center line of the mill.

Fig. 4 is an end elevation looking toward the running stone and with the frame broken away to illustrate the stone balance weights.

Similar reference numerals refer to similar parts throughout the drawings.

In the preferred embodiment of my invention illustrated in the drawings, I show a'base in the form of a flat bed plate 1 formed preferably of heavy cross connected t1mbers having attached along each 'outer side edge thereof a metal plate or strap 2',

in one end of each of which is provided an "elongated slot 3 disposed above the level of the frame and in the otherend of each of which is provided an opening'to receive a pivot pin. The means for directly supporting the running stone comprise two similar' frames 4 and 5 which are reversely disposed, the frame 4; comprising oneach side bottom members 6 which are adapted to be received between the side plates 2 and to be pivotally and adjustably connected to said plates at their outer ends by a transverse pivot pin 7 inserted through the slots 3 and through bearings 8 in the ends of the bottom members 6. This pivot pin is easily removable and provided for the ready detachment for the frame 4, and the pin being free to slide back and forth in the slots 3, permits the frame to be adjusted lengthwise of the base 1. The bottom members 6 of the frame 5 carry bearing at their outer ends similar to bearings 8 and receive a ivot pin 9 which will have its ends mounted to turn in the holes in the side plates 2 able to provide for the ready detachment of the frame 5.

The frame 5 is braced on each side by uprights 10 and longitudinal'bars 11, which latter bars, when the frame is horizontally membersand which is easily remov- I disposed, is of sufficient length to support its upper surface in substantially horizontal 7 position. This frame also compris'es'a transverse bearlng member 12 and parallel w th a the same is a second bearing 'member' 13 mounted in the uprights 10. These bear- 7 ing members respectively carry bearings 14 and 15, the latter of which is elongated to on, a bearing member 13? of the frame 4.

This latter frame comprises members 10.

and ll similar to 10 and 11. The extension mandrel extends beyond the'bearing 24 and has a socket in its end which receives a taper stud 25 on a pivoted spring 26 which 7 normally engages the shaft and presses it V inwardly. The spring is pivoted to the frame 4 and ,is free to be swung away from the extension mandrel when desired. This extension mandrel also carries a cam 27, which through rocker elements 28 will shake ,the feed trough 29 and deliver the grain through an air blastduct 30 into the top opening 31 in the outer end of a concave metallic crusher casing 32 which is rigidly secured in position in the, eye of the bed stone, and through the axial center of which passes the main mandrel 18 carrying fixed thereona metallic cone crusher, both the concave and the cone carrying co-acting burs or equivalent means for effecting a crushing or preliminary grinding of the grain while the same is being delivered through the eye of the bed stone to the grinding faces of the stones.

The stones are adjusted together by means of rods 33 which have their ends threaded to receive stop nuts 35 and fastening nuts 36, the nuts 35 being disposed to engage the adjacent inner faces of the frames 4 and '5 and space them apart while the. outer nuts hold the frames together.

are used two above and twobelow on each These tie rods side of the stones. By tightening up on these rods the frames can be adjusted together and locked with the grinding surfaces of the stones in abutment throughout, after which by unscrewing the set screw '17, the spring 26 will tend to separate the stones for the distance determined by. the set screw when they will run in true parallelism. They canbe easily adjusted nearer, or fartherapa'rt as may be: desired. A casing 37 surreundssthestones when the. mill is in operation and carries a discharge chute 38 whichis detachablyheld in position between the frames; g

The bed stone is mounted in a metallic sleeve 39 having longitudinal slots therein through which pass the bolts 40 by means of which thesleeve and bed stone are fixedly secured to the frame 4. V r V In the rear face of the running stone 20 I provide a plurality of radial slots 41 open ing through the perimeter of the stone and having their outer ends closed by a metallic band 42. Metallic plates 43 are inserted in curfs in the stone at the inner ends of the;

slot 41 and radial screws 44 are made fast at their ends to the plates 43' and band 42. Adjustable balance weights 45. are threaded 'on the screws 44-and by adjusting these radially thestone may haveits running balance preserved. To reduce its: friction the stone carries a bushing 46 secured thereto and adapted to receive the mandrel 18. 4

In' operation, having dressed the stones when in the position as shown in Fig. 2,

the frame 4 and 5 are swung to the position'shown in Fig. 1, the bolts 33 are insertedto draw'the frames together,the set screws- 17 having'been run in to move the mandrel and running stone inwardly. After- 7' I the frames have been coupled up in the manner described, the spring 26 is applied to the extension mandrel and thescrew 17 is turned" to permit the stones to separate the desired distance thereupon the mill is.

ready for operation. The grain is delivered between the cone and concave to be preliminarily crushed and then'passes radially outwardly between the stones, in which passageits grinding is completed. 7

The convenience of my frame work for taking the mill'apart and moving it will be obvious as the base and each frame 4 or 5 canallbe separated and handled conveniently. which is a great advantage, particu-..

larly in mills for country use.

Having thus described my invention, what I claimias new and desire to secure by Letters Patent, is

ion

1. In a vertical grinding mill, a running" stone carrying a crushing cone rigid therewith, ,a bed stone having 'a concave bur rigid therewith and adapted to receive said cone,,a bed plate, a separate frame support foreach stonehinged to said bed plate, ,tele

scoping mandrels carried by said frame supports and meansto permit said stones to be shifted apart sufficiently to disengage the mandrels and permit the cone'to clear the concave as thefstone frames swing apart on their hinge connections to said bedplate.

2. In a vertical grain:grindingmill, the combination with a bed stone and its hinged support, of av running stone audits hinged support, a driving mandrel for the running stonehich extend ,t rethr gh. nd int the eye of the bed stone, an extension manadapted to move apart sufficiently to dis- 10 drel detachably connected to said driving connect the mandrels andpermit the stones mandrel, bearings for said mandrels, a to swing With their supports to horizontal spring acting to press the extension manposition drel toward the running stone, at set screw In testlmony whereof I aflix my signature.

to hunt the movements lmpaited to the ASBERY T. HARE mandrels and running stone by said spring and to hold the stones in predetermined Witness:

running position, the stone supports being NOMIE WELSH;

Copies of this patent may be obtained for five cents eachfby addressing the Commissioner of Patents, Washington, D. G.

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